Ollie,
Yes, I was already registered. After I initally logged in, I navigated to the classified section. The "place Ad" option is not displayed unless I re-login which I did. Although I used the same login, I was required to re-login to see the "place" option. Hope that makes sense.

Just posted an add for a new 11m Fuel for a deal. Pass it on if you know anybody interested (I hear you're well connected